Lookup Akamai Staging Hosts to create a hosts file entry

staging.php

#!/usr/bin/php
<?php
# Convert a hostname to an "Akamai Staging" DNS entry

$parameters = array(
        'h' => 'help',
        'd' => 'debug'
);

$DEBUG = true;
$ip = array();
$hosts = array();

# Handle STDIN (list of sites)
stream_set_blocking(STDIN, 0);    # Don't block on STDIN
while ( $host=trim(fgets(STDIN))) {
        if (strpos($host, '#') === 0) {   # Skip comments
                continue;
        }

        # The following are to "clean up" the inputs
        $host = preg_replace('/\s*#.*$/', '', $host); #strip trailing comments
        $host = preg_replace('/^https?:\/\//', '', $host); # strip http:// or https://
        array_push($hosts, $host);
}

# HANDLE COMMAND LINE ARGS
$options = getopt(implode('', array_keys($parameters)), $parameters);
$DEBUG = isset($options['d']) || isset($options['debug']);

# The cleans up the argv array (removing options)
$pruneargv = array();
foreach ($options as $option => $value) {
        foreach ($argv as $key => $chunk) {
                $regex = '/^'. (isset($option[1]) ? '--' : '-') . $option . '/';
                if ($chunk == $value && $argv[$key-1][0] == '-' || preg_match($regex, $chunk)) {
                        array_push($pruneargv, $key);
                }
        }
}
while ($key = array_pop($pruneargv)) unset($argv[$key]);

# Look for hosts as command line args
foreach ($argv as $arg) {
        if ($arg == $argv[0]) continue; # skip command name
        if ( preg_match('/(\w\.){1,}\w/', $arg) ) { # Looks like a hostname
                array_push($hosts, $arg);
        } else {
                fputs (STDERR, "ERROR: $arg doesn't appear to be a host" . PHP_EOL);
        }
}


if (count($hosts) < 1) {
        fputs (STDERR, "ERROR: NO Hosts Specified" . PHP_EOL);
        exit(1);
die;
}

foreach ($hosts as $host) {
        $stagehost = get_staging_cname($host);
        if ( ! $stagehost ) {
                fputs (STDERR, "ERROR: Could not determine a staging CNAME for $host" . PHP_EOL);
                continue;
        }
        if ( ! isset($ip["$stagehost"]) ) {
                debug ("# gethostbyname: $stagehost ...");
                $ip["$stagehost"] = gethostbyname($stagehost);
        } else {
                debug ("# using cached value for $stagehost");
        }
        fputs (STDOUT, $ip["$stagehost"] . "\t" . $host . PHP_EOL);
}

# debug: print a debug message if $DEBUG is true
#  -- Args: msg - message to print
function debug($msg) {
        global $DEBUG;
        if ($DEBUG) fputs (STDERR, $msg . PHP_EOL);
}

# get_staging_cname: recursive function to return a staging CNAME that matches a regexp
#  -- Args: host - hostname, match - regexp we are looking for
#  -- Returns: CNAME target or FALSE
# NOTE: This chaos is not required on PHP 5.5+
function get_staging_cname($host, $match='/\.edge(suite|key).net$/i') {
        debug("# Querying $host ...");
        $results=dns_get_record($host, DNS_CNAME);
        #debug(print_r($results, true));
        $target = ''; # So we can catch the last $target
        foreach ($results as $result) {
                $target = $result['target'];
                debug("# target: $target");
                if ( preg_match($match, $target) ) {
                        $stagehost = preg_replace($match, '.edge${1}-staging.net', $target);
                        debug("# stagehost: $stagehost");
                        return $stagehost;
                }
        }
        if ( preg_match('/(\w\.){1,}\w/', $target) ) { # Looks like a hostname
                return get_staging_cname($target, $match);
        } else {
                return FALSE;
        }
}
?>

NOTE: For some reason, this hangs on OSX 10.10.2 / PHP 5.5.14.

Wireshark is showing me that its querying CNAME against nothing (), instead of the name it is supposed to. I consider it a PHP bug versus a script problem.